<template>
  <div class="table">
    <div class="crumbs">
      <i class="el-icon-tickets"></i>收藏信息
    </div>
    <div class="container">
    <div class="handle-box">
        <el-button type="primary" size="mini" @click="delAll">批量删除</el-button>
        <el-input v-model="select_word" size="mini" placeholder="筛选关键词" class="handle-input"></el-input>
      </div>
    </div>
    <el-table size="mini" ref="multipleTable" border style="width:100%" height="680px" :data="tableData" @selection-change="handleSelectionChange">
      <el-table-column type="selection" width="40"></el-table-column>            
      <el-table-column prop="name" label="歌手-歌名" align="center"></el-table-column>            
      <el-table-column label="操作" width="150" align="center">
        <template slot-scope="scope">
          <el-button size="mini" type="danger" @click="handleDelete(scope.row)">删除</el-button> 
        </template>
      </el-table-column>
    </el-table>
    
    <el-dialog title="删除歌曲" :visible.sync="delVisible" width="300px" center>
      <div align="center">删除不可恢复，是否确定删除？</div>
      <span slot="footer">
        <el-button size="mini" @click="delVisible = false">取消</el-button>
        <el-button size="mini" @click="deleteRow">确定</el-button>                
      </span>
    </el-dialog>
  </div>
</template>

<script>
import { mixin } from '../mixins/index';
import {songOfSongId,getCollectOfUserId,deleteCollection} from '../api/index';

export default {
  mixins: [mixin],
  props: ['id'],
  data(){
      return{
        delVisible: false,          // 删除弹窗是否显示
        tableData: [],
        tempData: [],
        select_word: '',
        idx: -1,                    // 当前选择项
        multipleSelection: [],      // 哪些项已经打勾
      }
  },
  watch:{
      // 搜索框里面的内容发生变化的时候，搜索结果table列表的内容跟着它的内容发生变化
      select_word: function(){
        if(this.select_word == ''){
          this.tableData = this.tempData;
        }else{
          this.tableData = [];
          for(let item of this.tempData){
            if(item.name.includes(this.select_word)){
              this.tableData.push(item);
            }
          }
        }
      }
  },
  created(){
      this.getData();
  },
  methods:{
    // 查询该用户所有收藏的歌曲
    getData(){
      this.tempData = [];
      this.tableData = [];
      getCollectOfUserId(this.$route.query.id).then(res => {
        for(let item of res){
          this.getSong(item.songId);
        }
      })
    },
    //根据歌曲id查询歌曲对象，放到tempData和tableData里面
    getSong(id){
      songOfSongId(id)
      .then(res => {
        this.tempData.push(res);
        this.tableData.push(res);
      })
      .catch(err => {
        console.log(err); 
      });
    },
    //删除一条歌曲
    deleteRow(){
      deleteCollection(this.$route.query.id,this.idx.id)
      .then(res => {
        if(res){
          this.getData();
          this.notify("删除成功","success");
        }else{
          this.notify("删除失败","error");
        }
      })
      .catch(err => {
        console.log(err);
      });
      this.delVisible = false;
    },
    //批量删除已经选择的项
    delAll(){
      for(let item of this.multipleSelection){
        this.handleDelete(item);
        this.deleteRow();
      }
      this.multipleSelection = [];
    }
  }   
}
</script>

<style scoped>
.handle-box{
  margin-bottom: 20px;
}
.handle-input{
  width: 300px;
  display: inline-block;
}
</style>